General Physics Questions And Answers


Q1. 
Pick out the apparatus used in the experiment of the photoelectric effect from the following.

Ans.
Glass tubes


Q2. 
Which photon is more energetic: A red one or a violet one?

Ans.
Violet


Q3. 
If the wavelength of electromagnetic radiation is doubled, what will happen to the energy of photons?

Ans.
Halved


Q4. 
What happens to the wavelength of a photon after it collides with an electron?

Ans.
Increases


Q5. 
Why are alkali metals most suited as photo-sensitive metals?

Ans.
Low work function


Q6. 
Which theory explained that electrons revolved in circular orbits?

Ans.
Bohr theory


Q7. 
Bohr’s model only works for hydrogen or helium.

Ans.
True


Q8. 
When is hydrogen stable?

Ans.
When the electron is at its ground state


Q9. 
Which of the following is found in the UV region of the spectrum?

Ans.
Lyman series


Q10. 
How many spectral lines does hydrogen have?

Ans.
Four